Effects of mating disruption and conventional pesticide treatments on populations of the tufted apple bud moth, Platynota idaeusalis, in North Carolina apple orchards

Trials were conducted during four consecutive summers (1995-1998) in North Carolina apple orchards to compare the effects of mating disruption and con ventional pesticide treatments on tufted apple bud moth, Platynota idaeusal is, populations with regard to number of males caught in pheromone traps, n umber of egg masses, number of leaf shelters, and feeding damage. Pheromone traps caught significantly fewer males in mating disruption than in non-di sruption plots. For the first generation, the number of tufted apple bud mo th egg masses was higher in the conventional treatment, but in the second-g eneration egg mass numbers did not differ among treatments. Neither the num ber of TABM leaf shelters found per hour, nor the percentage of fruit with TABM feeding damage was significantly different among treatments. However, when TABM populations were high, damage was generally greater in mating dis ruption plots. Because this insect is usually not of economic concern until populations reach high densities, this insect appears to be less amenable to control with mating disruption compared to other tortricids. (C) 2001 El sevier Science Ltd. All rights reserved.